"Magmatic" refers to anything related to magma, which is the molten rock found beneath the Earth's surface. When magma rises to the surface, it can erupt through volcanoes, forming various types of volcanic rocks. The study of magmatic processes helps scientists understand how the Earth's crust is formed and how volcanic eruptions occur. In geology, magmatic activity is crucial for the formation of igneous rocks, such as granite and basalt. These rocks are created when magma cools and solidifies, either beneath the surface or after an eruption. Understanding magmatic processes is essential for predicting volcanic activity and assessing geological hazards.